RARE-EARTH AMIDATE CHELATES

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The invention is directed to a composition having a lanthanide chelate being a lanthanide and a ligand wherein the ligand is represented by the formula wherein R1 is alkyl, aryl, or heteroaryl; R2 is alkyl, aminoalkyl, aryl or heteroaryl; with the proviso that R1 and R2 cannot both be phenyl, and with the proviso that R2 cannot be phenyl when R1 is alkyl.